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Big bore pipes for a small block is I think for the most part a larger diameter stinger(exhaust outlet). Big bore pipes are more geared for 32cc+ but Big bore pipes that are ment for 40cc+ big bore engines will not fit on small blocks (34&under).
Bigger displacement engines breathe more and exhaust more volume so your exhaust needs to be more free flowing so you get the most out of the engines performance.
Bigger displacement engines breathe more and exhaust more volume so your exhaust needs to be more free flowing so you get the most out of the engines performance.